Lawinenlagebericht

Mt Hood

Northwest Avalanche Center
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Lawinengefahr

Thu
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Veraltet — dieser Lagebericht ist 5 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Another round of snow Wednesday will gradually increase avalanche hazard throughout the day. Identify wind accumulated snow by observing fresh cornice development, actively blowing snow and stiff or textured surfaces. Steer around features and slopes greater than 35 degrees where you see these signs.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–2

    Small, but steady snow accumulations began to build fresh wind slabs over the last few days. Monday morning's snowfall allowed wind slabs to grow larger and deeper and Wednesday will bring additional snow that will continue to grow any lingering wind slabs. Wind slabs and sensitive fresh cornices will create heightened avalanche conditions on steep and poorly supported slopes at upper and middle elevations. A north component to the wind may result in wind slabs in unusual locations and add to the possibility of low elevation wind slabs. Use your powers of observation to identify the signs of recently wind-transported snow. Look for actively blowing snow, pillow-like drifts, fresh cornices, and stiff or textured snow as a sign that you could trigger a wind slab avalanche. Steer around steep start zones and slopes over 35 degrees where you see these signs.

    Example: Blowing snow deposits below ridgelines forming wind slabs. Photo: Shane Robinson

Avalanche Discussion

Sunday night and Monday brought significant new snow accumulation to Mt. Hood (12-18" at ski area bases). Another round of snow will develop Wednesday. Expect avalanche harard to rise steadily throughout the day peaking in the late afternoon. Shallow, but sensitive and widely propagating storm slabs were reported near and below treeline Monday morning, but by Tuesday this fresh snow will become wet and weak in the sunshine. At higher elevations, wind slabs are firmer and more stubborn but have the potential to be large. Avalanche problems should be confined to recent snow which sits above a melt-freeze crust formed during warm and sunny weather last week. Both wind slabs and loose wet avalanches will run easily on top of last week's melt-freeze crust. 

During the ongoing Covid-19 pandemic, continue to follow the latest guidance from local, state, and federal health officials. Avoid unnecessary risks that could impact first responders and stress medical resources.  Wear a mask when appropriate, practice social distancing, and consider recreating closer to home.

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